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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018d5272bc89565b75129e3673b33ef6fd9b6ae139f2cc334c559d93f4856ae2' 
  AND token = 'eSoPtTom8FsJ9kjmfLO1nC06WmnutjKnyT4sutz2nsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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