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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c126b76a2b613ae018e8d48822c22852f20f2d723fa2e3d5d8a29857abdb788' 
  AND token = 'j4uSi1/IGfyCPfHn0KwnZR417x+QDK1nDCqyxuPvbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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