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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8719c7b68481651a20d4750288519d5c7691df779fd1ddf77a8f6d8b34421c3' 
  AND token = 'mDCKnGDf6NrQc3xJyiDij5Cb6Z2M71JpVRy/ouz6Q1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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