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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e33c06a01d08b9f4d73ecbb10e59ea072d398178924ef4c84765f78a8cc0c2' 
  AND token = 'KC1HMquqLSCAEjHtTJP61ZFW1MFE5K8sDtFY9xguWcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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