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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15181c5e31ac19399055e5ecb31350f64904c6d032b7c49e4f83de6fb8c6a937' 
  AND token = '20FrWSnjW2su2ToRX+6a5rmxFq3dzyOcrC4cUE51gNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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