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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989692c0825eff8c83d7c3b681c01ee6c13fc2e08b6f1cd4db602ec959b5b3a0' 
  AND token = 'eXlPxzwDpPwo9p+AzIknQ4aL4s9T7uWaUW9hUrM0bPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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