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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37c7c2b8b00e3e1836b77b47832e94d0cce8adc17619cc9688413f9146a99c6' 
  AND token = 'exFkpPsLfVvRsVqvcgL6yt6ehc2gcvBZvJ40i/Kza2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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