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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cabf0ae95accb5fa0b0287d611bb7e185b3025df8ab1f8b812dd6a1d42d2367' 
  AND token = '9IJzgp84Bm79Ae/rzyUAcKSYoP7VOScYap/NfuYsrYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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