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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352f711b02cc0caa2c4866a36930cc81c892ad4c35401ac8814e50d5f223b64c' 
  AND token = 'LHS66seyTGFhBC//7e3OvNcYXB6L/5/xHLLESFP8IlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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