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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c34d0aa19b82d09199d8362a18c786d7f4afdabdffa062f15d6745f6511116' 
  AND token = '8n2HiEo2EDpoO5JS5YpkqGwhtnlUHOQbSBn6T6GlarU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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