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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46e31f5a5e1082085483410d018aba642da863d3170aec81f5bc724cfa19ea0' 
  AND token = 'nl1dN3GdytUg+wzSoKK6fa0qQuucCAW1Xfx+Tbi187s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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