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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a34be4623abe98923b054ade9cf4469f4d69570d5da71cdc4cb2891747ffba' 
  AND token = '7RRd6Cvf3+Dm4v26xGsTbB7pXR27AoHGw7z5DYvNm00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}