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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2101e05371d4a5b8145ba79a4bf3553126d5391a4a5b975e8239de47f90e8988' 
  AND token = 'scxF8yMbG86/KdAvXrh8w0aCZTXB7ff3EWPgdE8Tna8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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