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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1b2d871d042d77b55ed85ed89565d9acc96ead04393692ae513f4b890fea6' 
  AND token = 'UTDjyYirtC4TTCnPxv/fmO32QTLHC6f7ZMp27jyxGQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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