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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f89366d439338d7e91233abbce77e54ccb8b884a9b5db858884d3870deb11a' 
  AND token = 'CPRNK1eX9IU/yTlRM3n9qXahJu8lU4XGOB//nW8U098=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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