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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb6fa440361ebe273b749d389e9248c9db5436b67bc1e54fa4d5d5ef3373ce0' 
  AND token = 'kdCoWkFOto2Hw23D7FNC8KVaaN1/2y9r/F54qA6zVgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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