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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e12958a0a9257644d2d9378fc5a102f0f020e5da3034b9168122af7abe7b6f' 
  AND token = '8x17/bbDrhzBlzVSIt5ItM4blNkxgaKyqgUFyL5fmHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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