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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbef46c455e7f8fae4783bf92bd8d5009809aa256a42754509f98b6ffa373938' 
  AND token = '/2uP2kS44DYRdQz4iVbqqKmUJazoj9bog0/WTiWfHsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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