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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872e8876ba31aa65de9d691dc3304d4a76ff966350027f2f26ca9cd5b2d3f292' 
  AND token = 'prfI4vHN2TgWV8ezGl7I9ROuUKnRjOJtGgn0Lp0npVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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