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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08cbf6d534eefbeac1bb1c8be1448137575df0428892d3616cc2ac7d55e9485' 
  AND token = 'zsdPzgXuu/aLygdEtaesM2GSEU036AHZik5irDWndns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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