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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d53eea939122fdb2e8b5303d030c771c22a34734b6959e8043fa7da22334594' 
  AND token = '/nbT6tm1ESGhKdmGhufdpS8X7XZRkp6Yd6X/utycZh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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