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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fa4c7b5d96a7a87d31a338e571c81bc6c13d9969fc225bb4ee7906191f4857' 
  AND token = 'yJE7erEBmMdM5zYbghqsTGZfXw2OWR8IFvmeoNfrINA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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