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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d8a34fa2a3f543b33c951f478fa9aece31d01beff0ad0484182b5ebe721f10' 
  AND token = 'avByukB3r+n9hdGnyQrNZf/10Xsu5xNpaWuZKl+AqbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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