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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8178c60f1b55e22d6f1f3e85d3275464286128e8f870aeafc4ff670c72168cd6' 
  AND token = '8Y2oWPdlpYAmqIt8m4kuMsjWQuWso1Kz7muk/7lb3wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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