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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72328b2167a1722f28f12edbec59ecab968fdc7361f7c88c424602813baa56cb' 
  AND token = 'DkkRjDEoHmF5WzFm0RH41nGI1Uo9Fo93q/y+vgRqjRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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