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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644e23133e172a08389c2c1d02b15304281a0eb88a47af61618e96ea3ea3e494' 
  AND token = '6ojtOJP5jXMzgm8DXSNmZu/7Nkk2kk5QWd4g6PflCpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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