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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07f936ebf4322680660097814286115a3d7ef68430f4dd7ef0923cf0f718244' 
  AND token = 'ZKQ/CNMfR+mFLwkbx+Yi/9mHMDADuUtaezMYZj7iadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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