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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbd0a82ee80a27c91609f080af73ef8f6c7a728c7c91f4bf8ff232d5f988bd1' 
  AND token = 'Wm9t8x7m3TBvmnqkPCaMQsbO6nGcf3r/qo2Dl5klW/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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