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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eac04093e5d600e2bda8cdfdee10683b4c34aa46d284091e79e645dd49c8fc0' 
  AND token = 'xcsc2mvOKRhnzWmJqBT29DdowIWV5iOQACYJULItpTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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