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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141535a5cddfe58c7c32a477e23de9cb39b3ce2cb1a2631af01155b5976b75ef' 
  AND token = 'Wc5MuWe3PqB1+3ksisyM3Lm9jk6bJGJ9uAxB0IJnmGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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