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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b046ca423de663bc51d08778dcd08b4c2f49342c66d3ed0d71e15e4269abe9e3' 
  AND token = 'ZJmoSkpqNH1NifNKC38PP0rQH2NI3nvukpzsAroz8Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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