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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07b4a9238b8f241316b431b38187ec146f0966d385d44162a362aad19a48a13' 
  AND token = '6KMNFPHAWtwyhe8wJ5aT0QTdJWnLSAIyB8o2Zgcnjvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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