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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4075890bc17503e07dd7356e521b2b72826d777e86eb429c70828e5cda347ad2' 
  AND token = '07VnnggWIIBgygVEoc8XL10azBEoncoZ3+KKYZ9lGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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