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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb48fb8b642a58a473282ce0288459f875a5af499bf14ed5ab281dfacb62c90' 
  AND token = 'TeRCo0X1EccgmYqwB3LIVnmdwwJh1cRxdLlHcmgYgIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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