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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e7161dc76703ad9b944f7120429c2e34ea3609a688dd0870ef152c797a04a8' 
  AND token = 'tIKEbt5c4DFN0OdMy35sdoKc+7IX8X1AffLEwx17t8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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