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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1f69a8fe702e3a7751d20984a4a16d87134bbc7325f1cb4279fcde00ddecc8' 
  AND token = '/s5cl/kgrahznYFfnXwe6E1DBSsX2ZtsiayUSL29nMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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