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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5379d41b606e64663466b84ea83f84cdac7df1cb407d312a171f69c78d3ba9c7' 
  AND token = 'vDI4dyjfNCmrWZbU3Rva9k/A4f/MstztMW+HdOOrzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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