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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f677dde35bdb03aec89c4452c84cb2b3ab8fc58d67629d5b6180b23715713b' 
  AND token = '56+TVVJI/8yEJ8dZZfpX88An8X67tK3Btt20XXd6HAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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