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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6576852af3cedb6d34f050428f18a865ec881b77bbee8a5993323222f51714' 
  AND token = 'IfsY7/Y4QWaQ5sa9SpdyMgQsLz6aNebFhU0KyuXWC1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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