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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71486ce23a89e75e14f8c0b25fbbf9035c60247dec6f915a9701f9ae1e19ae57' 
  AND token = 'mlAiH+SkTeir5d8F4IFwrjBwWU7P3Lve+0LaqUJNJvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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