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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418659804855860ab5f664ac83d69f8102bf9d768442da5c8059f98fcf42ef68' 
  AND token = '7lCJBFBz+RxpakezyED8x9b0xW/nKOpHN5gsEWxyKBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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