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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11bb55c9e867d401279fd7218767ff2868178229a6a7321731d51a4633f9019' 
  AND token = '29nMdrbX5iloGHMyeMf+fQ432snLTGioB/Ypk5BNFj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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