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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bd2747a2fb613d314f292ae2007eae628d54944cf89de50deeda7ed3e5e23f' 
  AND token = 'j3IUniph8jL3mSqhDmOvnBNSE9URBxOwG1DChiJ9JHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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