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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0dfb063faec66c1740f2ca54fa490e2021c2075a8445bcac3bcec8cb967801' 
  AND token = 'NYruDgYe4OzCVCrJ5x2q2HvVXwvxRAqC+zk6+jrd4vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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