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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20547a091ed1bf37cb417292da65acc303c46c3887394f597fe73bfb0b029dd7' 
  AND token = 'MivmktAUZlhhDeIS0Ci+v66Byxs7+V1BJMLoWf/r8uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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