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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822f566218ccbb77e45ca6be6be15182064270464b8388fdf62b020293733e8d' 
  AND token = 'hKCJL8db9+uVAM0Bka8bBKDALDZqfYh1yePsgW64Nb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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