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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36261832c963e7e28725915c3e7bc2519679775cd2a4cc5dbb6eff2a5b5546f5' 
  AND token = 'C3UG72Ub1a5RNNojhikeMwHghthwthRQCmsF9+0aiYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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