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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c623553c05c578c0a7191fe4f885f6a9a96d4d364865cd297119d48191281b' 
  AND token = 'cYr9Q01EW3N7XYOWk/7jCo3IoUTObS8iBNWhbuvRVkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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