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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a85b0e0aad91a7e286a2437fac6c85f98b0ccb5cb8dc3ce34d6521c7786d3eb' 
  AND token = 'Iq1ZS1bMQGdQz3KlAtNsAJKh0PQ/+wuiZ2xJ37NrDLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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