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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3cea670786a509595a008f28f0de48b0deee09c0532d7af60c6cdcf9c73113' 
  AND token = 'UsWfV8JuWtqeWsySuGzQzFhtar6lQFu5LIeu5z/0mq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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