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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae790ad6a8793372005b34b3d24a6d4442e71f03848f420a8d6ee97b56f41a0' 
  AND token = 'uxlT7k42L23cgmfJXnZWZF9vwSRRYq3exMy+M5NYjFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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