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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e681139f9f2075a36bb8829f874fe9eb6e7fc63def1e0a78c6f63de8eed981' 
  AND token = 'qLh4fNx0t1PbuGElykaKrpE8uAyhc09TDCU1dHbPqVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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