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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5e2c6b315283bede6bb3f73410081be3f71fb48a2e7af37a3a776525c54cd1' 
  AND token = '6MUcNTxfXl4mWXx9znLyTlZvyGK0sTuttUq2TJgXon0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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