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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697c447d858629165792ea7ff70678c33acd33eed1e8b456ab1acbff1a7f5711' 
  AND token = 'O/STNlpYsci6Dsh5JmhmIziytMwPnWgcng3ConNMANQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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