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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffcca8ae67f43177cd5b669c23ac84a578cc9a6463493ca72ff9076df34d6ee' 
  AND token = '3VJ2UEnFYMaXXFUxGhRKEE763K6JO7gZoYi2sQUpvug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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