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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61170448a8c547376302d8e471ff66e13b332831489d9459c58d0aa4ad3642ae' 
  AND token = 'eQfjzHTpZhw1i7MNdVmn9qxfava989uLusCoIo5yVig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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