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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ebcabe5577dbb0a785325f59179a4b8a998237b2bfbbf3822305b434a32bc0' 
  AND token = 'RpO/5H2a8wMffTba6x103SStJp343cWqo2qlGwES4sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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