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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344e16c4fdf6f48255c70129657e6ca5176908e7d1e2490eca74c78dec66fea2' 
  AND token = '6HaivqBUUcQ1eeW5wyfq+cC4MRwWf+E4ZN82tDHiL74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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