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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2ef81a94585657ff937d20dd467dc2926d1eb3b18d41cfeda4b9cb810def03' 
  AND token = 'LTVvA+Oo2s2WrbMssJHuh0vP6egmsg+qzl+N+micMQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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