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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8505eb60a70d51beb62f0db9a73e578d247b19de9bf6cfc4be9402e8b78ce9' 
  AND token = '8q8D2nva0RUAMJa5rkvKd35ygzHAtEPYCrSqt+13okY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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