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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41add67cb40859472acaf6f554f0c86e51f2bebe159b052d78ff9a26384d619a' 
  AND token = 'f6VO7zV8A0mKNtm3EXx1hDrSG8WLglpAFcQ1wBirnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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