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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77831ad7a45797cf9e1dac45063cf51e982fa0fa92ecfe9de9964b7b69bb9597' 
  AND token = '7Pu3x4rCO3e+4GzKV9ZueFhnkvLuhp8ckb7wczFAAdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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