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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb65d30aa2b3324cc383f0eaed40d72ec3daa4690f8156141de1dc1e4caa825' 
  AND token = 'V58yhWLxo0dYbcjGcBuLPfEjJJA/AK6/CPJtir6kysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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