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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3d4b0cc255f37df88a2eda79b5050b093582a310fc474ad99b19fa5379a367' 
  AND token = 'Kbo2iXYSsH80kbh95KLXjK6gbq3SEHyg4kgF2+4zquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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