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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1145a022a5e8a858e686a3b77f81e4486901f5b598885a695cfa3b23df27f1' 
  AND token = 'dBwwn3Y1f3eP0ruoC0/KVZOzbef0e9D/S0exc+S+j8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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